Audio amplifier



FIG. 1 is a top, front, right side perspective view of an audio amplifier showing the new design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a left side elevation view thereof.

FIG. 5 is a right side elevation view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings are included to show portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a audio amplifier, as shown and described. 